| Hydrographic region | (1) | (2) | (3) |
| Solimões | −16.4 | 13.1 | 26.5 |
| Negro | 10.9 | 4.6 | −10.2 |
| Madeira | −22.4 | −31.1 | −15.9 |
| Xingu | −18.9 | −34.4 | −17.9 |
| Tapajós | −17.3 | −37.6 | −21.7 |
| Northern Amazon | −22.6 | −15.0 | −24.1 |
| Tocantins | −28.5 | −48.2 | −39.4 |
| Maranhão | −66.0 | −86.6 | −59.4 |
| Parnaíba | −12.1 | −65.6 | −59.1 |
| Northeast Atlantic | −6.4 | 1.7 | −48.6 |
| São Francisco | −29.3 | −62.7 | −41.2 |
| East Atlantic | −10.3 | −52.3 | −2.2 |
| Southeast Atlantic | 29.7 | 29.4 | 35.7 |
| South Atlantic | 89.4 | 90.7 | 89.9 |
| Uruguay | 70.2 | 27.1 | 33.6 |
| Parana | −28.9 | −44.8 | 7.8 |
| Paraguay | −25.9 | −37.8 | −6.2 |